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From Ted Dunning <tdunn...@maprtech.com>
Subject Re: Heap fragmentation
Date Thu, 20 Jan 2011 18:21:21 GMT
Thanks.

On Thu, Jan 20, 2011 at 10:10 AM, Todd Lipcon <todd@cloudera.com> wrote:

> The metrics were parsed from the gc log with -XX:+PrintFLSStatistics=1 on.
>
> I created new YCSB workloads for it. I updated the doc a bit and attached
> it
> as PDF to this new JIRA:
>
> https://issues.apache.org/jira/browse/HBASE-3455
>
> <https://issues.apache.org/jira/browse/HBASE-3455>-Todd
>
> On Thu, Jan 20, 2011 at 9:48 AM, Ted Dunning <tdunning@maprtech.com>
> wrote:
>
> > Also, can you say what YCSB workload that used?
> >
> > On Thu, Jan 20, 2011 at 9:33 AM, Todd Lipcon <todd@cloudera.com> wrote:
> >
> > > I did some experiments to understand our full GC issues better last
> > night.
> > > Here are the results:
> > > http://people.apache.org/~todd/hbase-fragmentation/
> > >
> > > <http://people.apache.org/~todd/hbase-fragmentation/>Basically my
> > > conclusion
> > > here is that (for these YCSB workloads) the memstore is way worse for
> > heap
> > > fragmentation than the block cache.
> > >
> > > Also we now have some tools and reference for comparison if we make any
> > > changes to memstore to try to combat this issue.
> > >
> > > -Todd
> > > --
> > > Todd Lipcon
> > > Software Engineer, Cloudera
> > >
> >
>
>
>
> --
> Todd Lipcon
> Software Engineer, Cloudera
>

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